Mingw: Fix compilation of release package

Makefile.mingw

@@ -27,7 +27,7 @@ build: config.h
 	$(MAKE) -C $(PLUGIN_SRC) -f Makefile.mingw
 	$(MAKE) -C $(PLUGIN_PO) -f Makefile.mingw
 
-config.h: VERSION configure.ac.in scripts/gen_mingw_config_h.sh
+config.h: VERSION scripts/gen_mingw_config_h.sh
 	./scripts/gen_mingw_config_h.sh > config.h
 
 dist: $(PLUGIN_WIN32_ZIP)

scripts/gen_mingw_config_h.sh

@@ -1,16 +1,22 @@
 #!/bin/bash
 
-GETTEXT_PACKAGE=$(grep 'GETTEXT_PACKAGE=' configure.ac.in | cut -d= -f2)
-PLUGIN_AUTHOR=$(grep 'PLUGIN_AUTHOR' configure.ac.in | cut -d\" -f2)
-PLUGIN_ID=$(grep 'PLUGIN_ID' configure.ac.in | cut -d\" -f2)
-PLUGIN_STATIC_NAME=$(grep 'PLUGIN_STATIC_NAME' configure.ac.in | cut -d\" -f2)
-PLUGIN_WEBSITE=$(grep 'PLUGIN_WEBSITE' configure.ac.in | cut -d\" -f2)
+if [ -f configure.ac.in ]; then
+	CONFIGURE_AC=configure.ac.in
+else
+	CONFIGURE_AC=configure.ac
+fi
+
+GETTEXT_PACKAGE=$(grep 'GETTEXT_PACKAGE=' $CONFIGURE_AC | cut -d= -f2)
+PLUGIN_AUTHOR=$(grep 'PLUGIN_AUTHOR' $CONFIGURE_AC | cut -d\" -f2)
+PLUGIN_ID=$(grep 'PLUGIN_ID' $CONFIGURE_AC | cut -d\" -f2)
+PLUGIN_STATIC_NAME=$(grep 'PLUGIN_STATIC_NAME' $CONFIGURE_AC | cut -d\" -f2)
+PLUGIN_WEBSITE=$(grep 'PLUGIN_WEBSITE' $CONFIGURE_AC | cut -d\" -f2)
 PLUGIN_VERSION=$(cat VERSION)
 
 
 cat << EOF
 /* Generated by scripts/gen_mingw_config_h.sh
- * from files VERSION and configure.ac.in.
+ * from files VERSION and $CONFIGURE_AC.
  */
 #define ENABLE_NLS 1
 #define GETTEXT_PACKAGE "$GETTEXT_PACKAGE"